Spanish tortilla is a typically Spanish dish consisting of a thick egg omelette made with potatoes and fried in olive oil.
The size of the frying pan is important. Diameter can't be too bit or small for the tortilla. If using a larger pan for more people, it should not be too heavy.
Use a non-stick pan if you don't have a well-seasoned frying pan. An enormous asset here is a flat plate that fits the pan.